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<script>
    let arr = [
        [1, 2, 3],
        [4, 5, 6],
        [7, 8, 9]
    ];
    //访问二维数组中的元素 
    let tep = arr[0];
    console.log(tep[0]);
    console.log(arr[0][0]);

    //二维数组的遍历
    for (let i = 0; i < arr.length; i++) {
        for (let j = 0; j < arr[i].length; j++) {
            console.log(arr[i][j]);
        }
    }
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